• FluTrackers.com Inc. does not provide medical advice. Information on this web site is collected from various internet resources, and the FluTrackers board of directors makes no warranty to the safety, efficacy, correctness or completeness of the information posted on this site by any author or poster. The information collated here is for instructional and/or discussion purposes only and is NOT intended to diagnose or treat any disease, illness, or other medical condition. Every individual reader or poster should seek advice from their personal physician/healthcare practitioner before considering or using any interventions that are discussed on this website. By continuing to access this website you agree to consult your personal physican before using any interventions posted on this website, and you agree to hold harmless FluTrackers.com Inc., the board of directors, the members, and all authors and posters for any effects from use of any medication, supplement, vitamin or other substance, device, intervention, etc. mentioned in posts on this website, or other internet venues referenced in posts on this website.
  • We are not asking for any donations. Do not donate to any entity who says they are raising funds for us.

CDC - Influenza A National Wastewater Data

sharon sanders

sharon sanders

Editor-in-Chief & President
from CDC -

Influenza A National Wastewater Data


Influenza A Wastewater Monitoring in the U.S.

Print
346089-A_WEB_WastewaterWebIcons_1_3-LOW-1.png


Nationally, the wastewater viral activity level for influenza A is currently very low. See influenza A data for your state/territory and county


On This Page
Wastewater monitoring can detect viruses spreading from one person to another within a community earlier than clinical testing and before people who are sick go to their doctor or hospital. It can also detect infections without symptoms. If you see increased wastewater viral activity levels, it might indicate that there is a higher risk of infection. See how to protect yourself from respiratory viruses.

Wastewater data are updated every Friday with the previous week’s data, which allows for data to be reviewed for accuracy. Data may change as more reports are received.

Current Wastewater Viral Activity Levels


This map shows the current wastewater viral activity level of influenza A for each state or territory. Tap or hover over a state or territory to see the viral activity level and number of sites reporting data. Time Period: July 13, 2025 - July 19, 2025

Skip Over Map Container U.S. territories

GUVI Influenza A Wastewater Viral Activity Levels


Select a level to add or remove from map.
  • Very High
  • High
  • Moderate
  • Low
  • Very Low
  • No Data
  • *Limited Coverage


* Based on a small segment (less than 5%) of the population and may not be representative of the state/territory.
Data last updated 2025-07-24

Link to Dataset Download Data (CSV) Skip Data Table
Data Table Skipped data table.
National Trends


This chart shows national trends of wastewater viral activity levels of influenza A. 1 Year6 Months45 DaysAll Results Skip Over Chart Container
Very LowLowModerateHighVery High08/17/2409/28/2411/09/2412/21/2402/01/2503/15/2504/26/2506/07/2507/19/25Week Ending
Data from the most recent two weeks may be incomplete due to delays in data reporting. These data sets are subject to change and are indicated by the gray shading.

Data last updated 2025-07-24

Link to Dataset Download Data (CSV) Skip Data Table
Data Table Skipped data table.
What Does this Data Mean?


Situational Summary
  • The ongoing avian influenza A (H5) (bird flu) outbreak in U.S dairy cows and poultry may be contributing to the moderate and high influenza (flu) A virus wastewater levels in some jurisdictions, based on reviewing multiple data sources. The risk to the public of avian influenza A (H5) is currently low.
  • Wastewater data for influenza A virus should be considered in combination with clinical sources of influenza A data.
  • Influenza A viruses include subtypes like avian influenza A(H5) virus and A(H1N1). Wastewater testing for overall influenza A virus cannot tell us what subtypes are present. Wastewater testing cannot tell us if the source of the influenza A virus is from humans, animals, or animal products.
  • Wastewater testing for influenza virus subtypes, including an H5 subtype, is underway across the United States. See Wastewater Data for Avian Influenza A(H5) for more information.
  • CDC and public health partners continue to investigate whether changing levels of influenza A virus in wastewater are related to seasonal influenza, the avian influenza A (H5) outbreak in animals, or both.


About the Wastewater Viral Activity Level: The wastewater viral activity level indicates whether the amount of virus in the wastewater is very low, low, moderate, high, or very high. The wastewater viral activity levels may indicate the risk of infection in an area. The wastewater viral activity levels are categorized as follows:
  • Up to 1.6 – Very Low
  • Greater than 1.6 and up to 4.5 – Low
  • Greater than 4.5 and up to 12.2 – Moderate
  • Greater than 12.2 and up to 20.1 – High
  • Greater than 20.1 – Very High
National data represent the median values across all wastewater treatment plants. To learn more on how the wastewater viral activity level is calculated, see Data Methods.

Data Limitations: Wastewater data cannot determine the source of influenza A viruses. Detections could come from a human or from an animal (like a bird) or an animal product (like milk from an infected cow).

Related Pages
Source: Centers for Disease Control and Prevention​

https://www.cdc.gov/nwss/rv/influenzaa-national-data.html
 
Influenza A National Wastewater Data


Influenza A Wastewater Monitoring in the U.S.

Print
346089-A_WEB_WastewaterWebIcons_1_3-LOW-1.png


Nationally, the wastewater viral activity level for influenza A is currently very low. See influenza A data for your state/territory and county


On This Page
Wastewater monitoring can detect viruses spreading from one person to another within a community earlier than clinical testing and before people who are sick go to their doctor or hospital. It can also detect infections without symptoms. If you see increased wastewater viral activity levels, it might indicate that there is a higher risk of infection. See how to protect yourself from respiratory viruses.

Wastewater data are updated every Friday with the previous week’s data, which allows for data to be reviewed for accuracy. Data may change as more reports are received.

Current Wastewater Viral Activity Levels


This map shows the current wastewater viral activity level of influenza A for each state or territory. Tap or hover over a state or territory to see the viral activity level and number of sites reporting data.

Time Period: July 20, 2025 - July 26, 2025

Skip Over Map Container U.S. territories

GUVI

Influenza A Wastewater Viral Activity Levels


Select a level to add or remove from map.
  • Very High
  • High
  • Moderate
  • Low
  • Very Low
  • No Data
  • *Limited Coverage


* Based on a small segment (less than 5%) of the population and may not be representative of the state/territory.
Data last updated 2025-07-31

Link to Dataset Download Data (CSV) Skip Data Table
Data Table Skipped data table.
National Trends


This chart shows national trends of wastewater viral activity levels of influenza A. 1 Year6 Months45 DaysAll Results Skip Over Chart Container
Very LowLowModerateHighVery High08/24/2410/05/2411/16/2412/28/2402/08/2503/22/2505/03/2506/14/2507/26/25Week Ending
Data from the most recent two weeks may be incomplete due to delays in data reporting. These data sets are subject to change and are indicated by the gray shading.

Data last updated 2025-07-31

Link to Dataset Download Data (CSV) Skip Data Table
Data Table Skipped data table.
What Does this Data Mean?


Situational Summary
  • The ongoing avian influenza A (H5) (bird flu) outbreak in U.S dairy cows and poultry may be contributing to the moderate and high influenza (flu) A virus wastewater levels in some jurisdictions, based on reviewing multiple data sources. The risk to the public of avian influenza A (H5) is currently low.
  • Wastewater data for influenza A virus should be considered in combination with clinical sources of influenza A data.
  • Influenza A viruses include subtypes like avian influenza A(H5) virus and A(H1N1). Wastewater testing for overall influenza A virus cannot tell us what subtypes are present. Wastewater testing cannot tell us if the source of the influenza A virus is from humans, animals, or animal products.
  • Wastewater testing for influenza virus subtypes, including an H5 subtype, is underway across the United States. See Wastewater Data for Avian Influenza A(H5) for more information.
  • CDC and public health partners continue to investigate whether changing levels of influenza A virus in wastewater are related to seasonal influenza, the avian influenza A (H5) outbreak in animals, or both.


About the Wastewater Viral Activity Level: The wastewater viral activity level indicates whether the amount of virus in the wastewater is very low, low, moderate, high, or very high. The wastewater viral activity levels may indicate the risk of infection in an area. The wastewater viral activity levels are categorized as follows:
  • Up to 1.6 – Very Low
  • Greater than 1.6 and up to 4.5 – Low
  • Greater than 4.5 and up to 12.2 – Moderate
  • Greater than 12.2 and up to 20.1 – High
  • Greater than 20.1 – Very High
National data represent the median values across all wastewater treatment plants. To learn more on how the wastewater viral activity level is calculated, see Data Methods.

Data Limitations: Wastewater data cannot determine the source of influenza A viruses. Detections could come from a human or from an animal (like a bird) or an animal product (like milk from an infected cow).

Related Pages
​https://www.cdc.gov/nwss/rv/InfluenzaA-national-data.html
 
Influenza A National Wastewater Data


Influenza A Wastewater Monitoring in the U.S.

Print
346089-A_WEB_WastewaterWebIcons_1_3-LOW-1.png


Nationally, the wastewater viral activity level for influenza A is currently very low. See influenza A data for your state/territory and county


On This Page
Wastewater monitoring can detect viruses spreading from one person to another within a community earlier than clinical testing and before people who are sick go to their doctor or hospital. It can also detect infections without symptoms. If you see increased wastewater viral activity levels, it might indicate that there is a higher risk of infection. See how to protect yourself from respiratory viruses.

Wastewater data are updated every Friday with the previous week’s data, which allows for data to be reviewed for accuracy. Data may change as more reports are received.

Current Wastewater Viral Activity Levels


This map shows the current wastewater viral activity level of influenza A for each state or territory. Tap or hover over a state or territory to see the viral activity level and number of sites reporting data. Time Period: July 27, 2025 - August 02, 2025

Skip Over Map Container U.S. territories

GUVI Influenza A Wastewater Viral Activity Levels


Select a level to add or remove from map.
  • Very High
  • High
  • Moderate
  • Low
  • Very Low
  • No Data
  • *Limited Coverage


* Based on a small segment (less than 5%) of the population and may not be representative of the state/territory.
Data last updated 2025-08-07

Link to Dataset Download Data (CSV) Skip Data Table
Data Table Skipped data table.
National Trends


This chart shows national trends of wastewater viral activity levels of influenza A. 1 Year6 Months45 DaysAll Results Skip Over Chart Container
Very LowLowModerateHighVery High08/31/2410/12/2411/23/2401/04/2502/15/2503/29/2505/10/2506/21/2508/02/25Week Ending
Data from the most recent two weeks may be incomplete due to delays in data reporting. These data sets are subject to change and are indicated by the gray shading.

Data last updated 2025-08-07

Link to Dataset Download Data (CSV) Skip Data Table
Data Table Skipped data table.
What Does this Data Mean?


Situational Summary
  • The ongoing avian influenza A (H5) (bird flu) outbreak in U.S dairy cows and poultry may be contributing to the moderate and high influenza (flu) A virus wastewater levels in some jurisdictions, based on reviewing multiple data sources. The risk to the public of avian influenza A (H5) is currently low.
  • Wastewater data for influenza A virus should be considered in combination with clinical sources of influenza A data.
  • Influenza A viruses include subtypes like avian influenza A(H5) virus and A(H1N1). Wastewater testing for overall influenza A virus cannot tell us what subtypes are present. Wastewater testing cannot tell us if the source of the influenza A virus is from humans, animals, or animal products.
  • Wastewater testing for influenza virus subtypes, including an H5 subtype, is underway across the United States. See Wastewater Data for Avian Influenza A(H5) for more information.
  • CDC and public health partners continue to investigate whether changing levels of influenza A virus in wastewater are related to seasonal influenza, the avian influenza A (H5) outbreak in animals, or both.


About the Wastewater Viral Activity Level: The wastewater viral activity level indicates whether the amount of virus in the wastewater is very low, low, moderate, high, or very high. The wastewater viral activity levels may indicate the risk of infection in an area. The wastewater viral activity levels are categorized as follows:
  • Up to 1.6 – Very Low
  • Greater than 1.6 and up to 4.5 – Low
  • Greater than 4.5 and up to 12.2 – Moderate
  • Greater than 12.2 and up to 20.1 – High
  • Greater than 20.1 – Very High
National data represent the median values across all wastewater treatment plants. To learn more on how the wastewater viral activity level is calculated, see Data Methods.

Data Limitations: Wastewater data cannot determine the source of influenza A viruses. Detections could come from a human or from an animal (like a bird) or an animal product (like milk from an infected cow).

Related Pages
​https://www.cdc.gov/nwss/rv/InfluenzaA-national-data.html
 
Influenza A National Wastewater Data


Influenza A Wastewater Monitoring in the U.S.

Print
346089-A_WEB_WastewaterWebIcons_1_3-LOW-1.png


Nationally, the wastewater viral activity level for influenza A is currently very low.

Region with the highest wastewater viral activity level for influenza A:
NA


On This Page
Wastewater monitoring can detect viruses spreading from one person to another within a community earlier than clinical testing and before people who are sick go to their doctor or hospital. It can also detect infections without symptoms. If you see increased wastewater viral activity levels, it might indicate that there is a higher risk of infection. See how to protect yourself from respiratory viruses.

Wastewater data are updated every Friday with the previous week’s data, which allows for data to be reviewed for accuracy. Data may change as more reports are received.

Current Wastewater Viral Activity Levels


This map shows the current wastewater viral activity level of influenza A for each state or territory. Tap or hover over a state or territory to see the viral activity level and number of sites reporting data. Time Period: August 03, 2025 - August 09, 2025

Skip Over Map Container U.S. territories

GUGUVI Influenza A Wastewater Viral Activity Levels


Select a level to add or remove from map.
  • Very High
  • High
  • Moderate
  • Low
  • Very Low
  • No Data
  • *Limited Coverage


* Based on a small segment (less than 5%) of the population and may not be representative of the state/territory.
Data last updated 2025-08-14

Link to Dataset Download Data (CSV) Skip Data Table
Data Table Skipped data table.
National and Regional Trends


This chart shows national and regional trends of wastewater viral activity levels of influenza A. 1 Year6 Months45 DaysAll Results Skip Over Chart Container
Very LowLowModerateHighVery High09/07/2410/19/2411/30/2401/11/2502/22/2504/05/2505/17/2506/28/2508/09/25Week Ending
Data from the most recent two weeks may be incomplete due to delays in data reporting. These data sets are subject to change and are indicated by the gray shading.

Data last updated 2025-08-14

Link to Dataset Download Data (CSV) Skip Data Table
Data Table Skipped data table.



On August 15, 2025, CDC updated the methodology used to calculate the wastewater viral activity level. For more information, visit CDC’s Wastewater Surveillance Data Methodology page.

About the Wastewater Viral Activity Level: The wastewater viral activity level indicates whether the amount of virus in the wastewater is very low, low, moderate, high, or very high. The wastewater viral activity levels may indicate the risk of infection in an area. The wastewater viral activity levels are categorized as follows:
  • Up to 2.7 – Very Low
  • Greater than 2.7 and up to 6.2 – Low
  • Greater than 6.2 and up to 11.2 – Moderate
  • Greater than 11.2 and up to 17.6 – High
  • Greater than 17.6 – Very High
To learn more on how the wastewater viral activity level is calculated, visit CDC’s Wastewater Surveillance Data Methodology page.

Regions: States and territories are grouped into the following U.S Census Bureau regions:
  • West: Alaska, Arizona, California, Colorado, Guam, Hawaii, Idaho, Montana, Nevada, New Mexico, Oregon, Utah, Washington, Wyoming (N=14)
  • Midwest: Illinois, Indiana, Iowa, Kansas, Michigan, Minnesota, Missouri, Nebraska, North Dakota, Ohio, South Dakota, Wisconsin (N=12)
  • Northeast: Connecticut, Maine, Massachusetts, New Hampshire, New Jersey, New York, Pennsylvania, Puerto Rico, Rhode Island, Vermont (N=10)
  • South: Arkansas, Alabama, Delaware, District of Columbia, Florida, Georgia, Kentucky, Louisiana, Maryland, Mississippi, North Carolina, Oklahoma, South Carolina, Tennessee, Texas, Virginia, West Virginia (N=17)
No Data: States or territories without sufficient data to estimate the wastewater viral activity level for the previous week are indicated as “No Data.” A label of “No Data” means that either:
  • No data were reported this week from sites within the state or territory
  • Data were reported this week, but sites within the state or territory do not have enough data (at least 8 weeks with consistent methodology) to estimate the wastewater viral activity level in the last week.
Limited Coverage: States or territories with limited coverage means that data for the most recent week are based on a small part (less than 5%) of the population and may not represent viral activity levels for the entire state or territory.

Data Limitations: Wastewater data cannot determine the source of influenza A viruses. Detections could come from a human or from an animal (like a bird) or an animal product (like milk from an infected cow).

Related Pages
​https://www.cdc.gov/nwss/rv/InfluenzaA-national-data.html
 
Influenza A National Wastewater Data


Influenza A Wastewater Monitoring in the U.S.

Print
346089-A_WEB_WastewaterWebIcons_1_3-LOW-1.png


Nationally, the wastewater viral activity level for influenza A is currently very low.

Region with the highest wastewater viral activity level for influenza A:
NA


On This Page
Wastewater monitoring can detect viruses spreading from one person to another within a community earlier than clinical testing and before people who are sick go to their doctor or hospital. It can also detect infections without symptoms. If you see increased wastewater viral activity levels, it might indicate that there is a higher risk of infection. See how to protect yourself from respiratory viruses.

Wastewater data are updated every Friday with the previous week’s data, which allows for data to be reviewed for accuracy. Data may change as more reports are received.

Current Wastewater Viral Activity Levels


This map shows the current wastewater viral activity level of influenza A for each state or territory. Tap or hover over a state or territory to see the viral activity level and number of sites reporting data. Time Period: August 17, 2025 - August 23, 2025

Skip Over Map Container
U.S. territoriesGUGUVI Influenza A Wastewater Viral Activity Levels


Select a level to add or remove from map.
  • Very High
  • High
  • Moderate
  • Low
  • Very Low
  • No Data
  • *Limited Coverage


* Based on a small segment (less than 5%) of the population and may not be representative of the state/territory.
Data last updated 2025-08-28

Link to Dataset Download Data (CSV) Skip Data Table
Data Table Skipped data table.
National and Regional Trends


This chart shows national and regional trends of wastewater viral activity levels of influenza A. 1 Year6 Months45 DaysAll Results Skip Over Chart Container
Very LowLowModerateHighVery High09/21/2411/02/2412/14/2401/25/2503/08/2504/19/2505/31/2507/12/2508/23/25Week Ending
Data from the most recent two weeks may be incomplete due to delays in data reporting. These data sets are subject to change and are indicated by the gray shading.

Data last updated 2025-08-28

Link to Dataset Download Data (CSV) Skip Data Table
Data Table Skipped data table.



On August 15, 2025, CDC updated the methodology used to calculate the wastewater viral activity level. For more information, visit CDC’s Wastewater Surveillance Data Methodology page.

About the Wastewater Viral Activity Level: The wastewater viral activity level indicates whether the amount of virus in the wastewater is very low, low, moderate, high, or very high. The wastewater viral activity levels may indicate the risk of infection in an area. The wastewater viral activity levels are categorized as follows:
  • Up to 2.7 – Very Low
  • Greater than 2.7 and up to 6.2 – Low
  • Greater than 6.2 and up to 11.2 – Moderate
  • Greater than 11.2 and up to 17.6 – High
  • Greater than 17.6 – Very High
To learn more on how the wastewater viral activity level is calculated, visit CDC’s Wastewater Surveillance Data Methodology page.

Regions: States and territories are grouped into the following U.S Census Bureau regions:
  • West: Alaska, Arizona, California, Colorado, Guam, Hawaii, Idaho, Montana, Nevada, New Mexico, Oregon, Utah, Washington, Wyoming (N=14)
  • Midwest: Illinois, Indiana, Iowa, Kansas, Michigan, Minnesota, Missouri, Nebraska, North Dakota, Ohio, South Dakota, Wisconsin (N=12)
  • Northeast: Connecticut, Maine, Massachusetts, New Hampshire, New Jersey, New York, Pennsylvania, Puerto Rico, Rhode Island, Vermont (N=10)
  • South: Arkansas, Alabama, Delaware, District of Columbia, Florida, Georgia, Kentucky, Louisiana, Maryland, Mississippi, North Carolina, Oklahoma, South Carolina, Tennessee, Texas, Virginia, West Virginia (N=17)
No Data: States or territories without sufficient data to estimate the wastewater viral activity level for the previous week are indicated as “No Data.” A label of “No Data” means that either:
  • No data were reported this week from sites within the state or territory
  • Data were reported this week, but sites within the state or territory do not have enough data (at least 8 weeks with consistent methodology) to estimate the wastewater viral activity level in the last week.
Limited Coverage: States or territories with limited coverage means that data for the most recent week are based on a small part (less than 5%) of the population and may not represent viral activity levels for the entire state or territory.

Data Limitations: Wastewater data cannot determine the source of influenza A viruses. Detections could come from a human or from an animal (like a bird) or an animal product (like milk from an infected cow).

Related Pages
​https://www.cdc.gov/nwss/rv/InfluenzaA-national-data.html
 
Influenza A National Wastewater Data


Influenza A Wastewater Monitoring in the U.S.

Print
346089-A_WEB_WastewaterWebIcons_1_3-LOW-1.png


Nationally, the wastewater viral activity level for influenza A is currently very low.

Region with the highest wastewater viral activity level for influenza A:
NA


On This Page
Wastewater monitoring can detect viruses spreading from one person to another within a community earlier than clinical testing and before people who are sick go to their doctor or hospital. It can also detect infections without symptoms. If you see increased wastewater viral activity levels, it might indicate that there is a higher risk of infection. See how to protect yourself from respiratory viruses.

Wastewater data are updated every Friday with the previous week’s data, which allows for data to be reviewed for accuracy. Data may change as more reports are received.

Current Wastewater Viral Activity Levels


This map shows the current wastewater viral activity level of influenza A for each state or territory. Tap or hover over a state or territory to see the viral activity level and number of sites reporting data. Time Period: August 24, 2025 - August 30, 2025

Skip Over Map Container
U.S. territoriesGUGUVI Influenza A Wastewater Viral Activity Levels


Select a level to add or remove from map.
  • Very High
  • High
  • Moderate
  • Low
  • Very Low
  • No Data
  • *Limited Coverage


* Based on a small segment (less than 5%) of the population and may not be representative of the state/territory.
Data last updated 2025-09-04

Link to Dataset Download Data (CSV) Skip Data Table
Data Table Skipped data table.
National and Regional Trends


This chart shows national and regional trends of wastewater viral activity levels of influenza A. 1 Year6 Months45 DaysAll Results Skip Over Chart Container
Very LowLowModerateHighVery High09/28/2411/09/2412/21/2402/01/2503/15/2504/26/2506/07/2507/19/2508/30/25Week Ending
Data from the most recent two weeks may be incomplete due to delays in data reporting. These data sets are subject to change and are indicated by the gray shading.

Data last updated FromDB

Link to Dataset Download Data (CSV) Skip Data Table
Data Table Skipped data table.



On August 15, 2025, CDC updated the methodology used to calculate the wastewater viral activity level. For more information, visit CDC’s Wastewater Surveillance Data Methodology page.

About the Wastewater Viral Activity Level: The wastewater viral activity level indicates whether the amount of virus in the wastewater is very low, low, moderate, high, or very high. The wastewater viral activity levels may indicate the risk of infection in an area. The wastewater viral activity levels are categorized as follows:
  • Up to 2.7 – Very Low
  • Greater than 2.7 and up to 6.2 – Low
  • Greater than 6.2 and up to 11.2 – Moderate
  • Greater than 11.2 and up to 17.6 – High
  • Greater than 17.6 – Very High
To learn more on how the wastewater viral activity level is calculated, visit CDC’s Wastewater Surveillance Data Methodology page.

Regions: States and territories are grouped into the following U.S Census Bureau regions:
  • West: Alaska, Arizona, California, Colorado, Guam, Hawaii, Idaho, Montana, Nevada, New Mexico, Oregon, Utah, Washington, Wyoming (N=14)
  • Midwest: Illinois, Indiana, Iowa, Kansas, Michigan, Minnesota, Missouri, Nebraska, North Dakota, Ohio, South Dakota, Wisconsin (N=12)
  • Northeast: Connecticut, Maine, Massachusetts, New Hampshire, New Jersey, New York, Pennsylvania, Puerto Rico, Rhode Island, Vermont (N=10)
  • South: Arkansas, Alabama, Delaware, District of Columbia, Florida, Georgia, Kentucky, Louisiana, Maryland, Mississippi, North Carolina, Oklahoma, South Carolina, Tennessee, Texas, Virginia, West Virginia (N=17)
No Data: States or territories without sufficient data to estimate the wastewater viral activity level for the previous week are indicated as “No Data.” A label of “No Data” means that either:
  • No data were reported this week from sites within the state or territory
  • Data were reported this week, but sites within the state or territory do not have enough data (at least 8 weeks with consistent methodology) to estimate the wastewater viral activity level in the last week.
Limited Coverage: States or territories with limited coverage means that data for the most recent week are based on a small part (less than 5%) of the population and may not represent viral activity levels for the entire state or territory.

Data Limitations: Wastewater data cannot determine the source of influenza A viruses. Detections could come from a human or from an animal (like a bird) or an animal product (like milk from an infected cow).

Related Pages
​https://www.cdc.gov/nwss/rv/InfluenzaA-national-data.html
 
Influenza A National Wastewater Data


Influenza A Wastewater Monitoring in the U.S.

Print
346089-A_WEB_WastewaterWebIcons_1_3-LOW-1.png


Nationally, the wastewater viral activity level for influenza A is currently very low.

Region with the highest wastewater viral activity level for influenza A:
NA


On This Page
Wastewater monitoring can detect viruses spreading from one person to another within a community earlier than clinical testing and before people who are sick go to their doctor or hospital. It can also detect infections without symptoms. If you see increased wastewater viral activity levels, it might indicate that there is a higher risk of infection. See how to protect yourself from respiratory viruses.

Wastewater data are updated every Friday with the previous week’s data, which allows for data to be reviewed for accuracy. Data may change as more reports are received.

Current Wastewater Viral Activity Levels


This map shows the current wastewater viral activity level of influenza A for each state or territory. Tap or hover over a state or territory to see the viral activity level and number of sites reporting data. Time Period: August 31, 2025 - September 06, 2025

Skip Over Map Container
U.S. territoriesGUGUVI Influenza A Wastewater Viral Activity Levels


Select a level to add or remove from map.
  • Very High
  • High
  • Moderate
  • Low
  • Very Low
  • No Data
  • *Limited Coverage


* Based on a small segment (less than 5%) of the population and may not be representative of the state/territory.
Data last updated 2025-09-11

Link to Dataset Download Data (CSV) Skip Data Table
Data Table Skipped data table.
National and Regional Trends


This chart shows national and regional trends of wastewater viral activity levels of influenza A. 1 Year6 Months45 DaysAll Results Skip Over Chart Container
Very LowLowModerateHighVery High10/05/2411/16/2412/28/2402/08/2503/22/2505/03/2506/14/2507/26/2509/06/25Week Ending
Data from the most recent two weeks may be incomplete due to delays in data reporting. These data sets are subject to change and are indicated by the gray shading.

Data last updated 2025-09-11

Link to Dataset Download Data (CSV) Skip Data Table
Data Table Skipped data table.



About the Wastewater Viral Activity Level: The wastewater viral activity level indicates whether the amount of virus in the wastewater is very low, low, moderate, high, or very high. The wastewater viral activity levels may indicate the risk of infection in an area. The wastewater viral activity levels are categorized as follows:
  • Up to 2.7 – Very Low
  • Greater than 2.7 and up to 6.2 – Low
  • Greater than 6.2 and up to 11.2 – Moderate
  • Greater than 11.2 and up to 17.6 – High
  • Greater than 17.6 – Very High
To learn more on how the wastewater viral activity level is calculated, visit CDC’s Wastewater Surveillance Data Methodology page.

Regions: States and territories are grouped into the following U.S Census Bureau regions:
  • West: Alaska, Arizona, California, Colorado, Guam, Hawaii, Idaho, Montana, Nevada, New Mexico, Oregon, Utah, Washington, Wyoming (N=14)
  • Midwest: Illinois, Indiana, Iowa, Kansas, Michigan, Minnesota, Missouri, Nebraska, North Dakota, Ohio, South Dakota, Wisconsin (N=12)
  • Northeast: Connecticut, Maine, Massachusetts, New Hampshire, New Jersey, New York, Pennsylvania, Puerto Rico, Rhode Island, Vermont (N=10)
  • South: Arkansas, Alabama, Delaware, District of Columbia, Florida, Georgia, Kentucky, Louisiana, Maryland, Mississippi, North Carolina, Oklahoma, South Carolina, Tennessee, Texas, Virginia, West Virginia (N=17)
No Data: States or territories without sufficient data to estimate the wastewater viral activity level for the previous week are indicated as “No Data.” A label of “No Data” means that either:
  • No data were reported this week from sites within the state or territory
  • Data were reported this week, but sites within the state or territory do not have enough data (at least 8 weeks with consistent methodology) to estimate the wastewater viral activity level in the last week.
Limited Coverage: States or territories with limited coverage means that data for the most recent week are based on a small part (less than 5%) of the population and may not represent viral activity levels for the entire state or territory.

Data Limitations: Wastewater data cannot determine the source of influenza A viruses. Detections could come from a human or from an animal (like a bird) or an animal product (like milk from an infected cow).

Related Pages
​https://www.cdc.gov/nwss/rv/InfluenzaA-national-data.html
 
Influenza A National Wastewater Data


Influenza A Wastewater Monitoring in the U.S.

Print
346089-A_WEB_WastewaterWebIcons_1_3-LOW-1.png


Nationally, the wastewater viral activity level for influenza A is currently very low.

Region with the highest wastewater viral activity level for influenza A:
NA


On This Page
Wastewater monitoring can detect viruses spreading from one person to another within a community earlier than clinical testing and before people who are sick go to their doctor or hospital. It can also detect infections without symptoms. If you see increased wastewater viral activity levels, it might indicate that there is a higher risk of infection. See how to protect yourself from respiratory viruses.

Wastewater data are updated every Friday with the previous week’s data, which allows for data to be reviewed for accuracy. Data may change as more reports are received.

Current Wastewater Viral Activity Levels


This map shows the current wastewater viral activity level of influenza A for each state or territory. Tap or hover over a state or territory to see the viral activity level and number of sites reporting data. Time Period: September 07, 2025 - September 13, 2025

Skip Over Map Container
U.S. territoriesGUGUVI Influenza A Wastewater Viral Activity Levels


Select a level to add or remove from map.
  • Very High
  • High
  • Moderate
  • Low
  • Very Low
  • No Data
  • *Limited Coverage


* Based on a small segment (less than 5%) of the population and may not be representative of the state/territory.
Data last updated 2025-09-18

Link to Dataset Download Data (CSV) Skip Data Table
Data Table Skipped data table.
National and Regional Trends


This chart shows national and regional trends of wastewater viral activity levels of influenza A. 1 Year6 Months45 DaysAll Results Skip Over Chart Container
Very LowLowModerateHighVery High10/12/2411/23/2401/04/2502/15/2503/29/2505/10/2506/21/2508/02/2509/13/25Week Ending
Data from the most recent two weeks may be incomplete due to delays in data reporting. These data sets are subject to change and are indicated by the gray shading.

Data last updated FromDB

Link to Dataset Download Data (CSV) Skip Data Table
Data Table Skipped data table.



About the Wastewater Viral Activity Level: The wastewater viral activity level indicates whether the amount of virus in the wastewater is very low, low, moderate, high, or very high. The wastewater viral activity levels may indicate the risk of infection in an area. The wastewater viral activity levels are categorized as follows:
  • Up to 2.7 – Very Low
  • Greater than 2.7 and up to 6.2 – Low
  • Greater than 6.2 and up to 11.2 – Moderate
  • Greater than 11.2 and up to 17.6 – High
  • Greater than 17.6 – Very High
To learn more on how the wastewater viral activity level is calculated, visit CDC’s Wastewater Surveillance Data Methodology page.

Regions: States and territories are grouped into the following U.S Census Bureau regions:
  • West: Alaska, Arizona, California, Colorado, Guam, Hawaii, Idaho, Montana, Nevada, New Mexico, Oregon, Utah, Washington, Wyoming (N=14)
  • Midwest: Illinois, Indiana, Iowa, Kansas, Michigan, Minnesota, Missouri, Nebraska, North Dakota, Ohio, South Dakota, Wisconsin (N=12)
  • Northeast: Connecticut, Maine, Massachusetts, New Hampshire, New Jersey, New York, Pennsylvania, Puerto Rico, Rhode Island, Vermont (N=10)
  • South: Arkansas, Alabama, Delaware, District of Columbia, Florida, Georgia, Kentucky, Louisiana, Maryland, Mississippi, North Carolina, Oklahoma, South Carolina, Tennessee, Texas, Virginia, West Virginia (N=17)
No Data: States or territories without sufficient data to estimate the wastewater viral activity level for the previous week are indicated as “No Data.” A label of “No Data” means that either:
  • No data were reported this week from sites within the state or territory
  • Data were reported this week, but sites within the state or territory do not have enough data (at least 8 weeks with consistent methodology) to estimate the wastewater viral activity level in the last week.
Limited Coverage: States or territories with limited coverage means that data for the most recent week are based on a small part (less than 5%) of the population and may not represent viral activity levels for the entire state or territory.

Data Limitations: Wastewater data cannot determine the source of influenza A viruses. Detections could come from a human or from an animal (like a bird) or an animal product (like milk from an infected cow).

Related Pages
​https://www.cdc.gov/nwss/rv/InfluenzaA-national-data.html
 
Influenza A National Wastewater Data


Influenza A Wastewater Monitoring in the U.S.

Print
346089-A_WEB_WastewaterWebIcons_1_3-LOW-1.png


Nationally, the wastewater viral activity level for influenza A is currently very low.

Region with the highest wastewater viral activity level for influenza A:
NA


On This Page
Wastewater monitoring can detect viruses spreading from one person to another within a community earlier than clinical testing and before people who are sick go to their doctor or hospital. It can also detect infections without symptoms. If you see increased wastewater viral activity levels, it might indicate that there is a higher risk of infection. See how to protect yourself from respiratory viruses.

Wastewater data are updated every Friday with the previous week’s data, which allows for data to be reviewed for accuracy. Data may change as more reports are received.

Current Wastewater Viral Activity Levels


This map shows the current wastewater viral activity level of influenza A for each state or territory. Tap or hover over a state or territory to see the viral activity level and number of sites reporting data. Time Period: September 14, 2025 - September 20, 2025

Skip Over Map Container
U.S. territoriesGUGUVI Influenza A Wastewater Viral Activity Levels


Select a level to add or remove from map.
  • Very High
  • High
  • Moderate
  • Low
  • Very Low
  • No Data
  • *Limited Coverage


* Based on a small segment (less than 5%) of the population and may not be representative of the state/territory.
Data last updated 2025-09-25

Link to Dataset Download Data (CSV) Skip Data Table
Data Table Skipped data table.
National and Regional Trends


This chart shows national and regional trends of wastewater viral activity levels of influenza A. 1 Year6 Months45 DaysAll Results Skip Over Chart Container
Very LowLowModerateHighVery High10/19/2411/30/2401/11/2502/22/2504/05/2505/17/2506/28/2508/09/2509/20/25Week Ending
Data from the most recent two weeks may be incomplete due to delays in data reporting. These data sets are subject to change and are indicated by the gray shading.

Data last updated 2025-09-25

Link to Dataset Download Data (CSV) Skip Data Table
Data Table Skipped data table.



About the Wastewater Viral Activity Level: The wastewater viral activity level indicates whether the amount of virus in the wastewater is very low, low, moderate, high, or very high. The wastewater viral activity levels may indicate the risk of infection in an area. The wastewater viral activity levels are categorized as follows:
  • Up to 2.7 – Very Low
  • Greater than 2.7 and up to 6.2 – Low
  • Greater than 6.2 and up to 11.2 – Moderate
  • Greater than 11.2 and up to 17.6 – High
  • Greater than 17.6 – Very High
To learn more about how the wastewater viral activity level is calculated, visit CDC’s Wastewater Surveillance Data Methodology page. Additional wastewater data are available at CDC Wastewater Data for Influenza A.

Regions: States and territories are grouped into the following U.S Census Bureau regions:
  • West: Alaska, Arizona, California, Colorado, Guam, Hawaii, Idaho, Montana, Nevada, New Mexico, Oregon, Utah, Washington, Wyoming (N=14)
  • Midwest: Illinois, Indiana, Iowa, Kansas, Michigan, Minnesota, Missouri, Nebraska, North Dakota, Ohio, South Dakota, Wisconsin (N=12)
  • Northeast: Connecticut, Maine, Massachusetts, New Hampshire, New Jersey, New York, Pennsylvania, Puerto Rico, Rhode Island, Vermont (N=10)
  • South: Arkansas, Alabama, Delaware, District of Columbia, Florida, Georgia, Kentucky, Louisiana, Maryland, Mississippi, North Carolina, Oklahoma, South Carolina, Tennessee, Texas, Virginia, West Virginia (N=17)
No Data: States or territories without sufficient data to estimate the wastewater viral activity level for the previous week are indicated as “No Data.” A label of “No Data” means that either:
  • No data were reported this week from sites within the state or territory
  • Data were reported this week, but sites within the state or territory do not have enough data (at least 8 weeks with consistent methodology) to estimate the wastewater viral activity level in the last week.
Limited Coverage: States or territories with limited coverage means that data for the most recent week are based on a small part (less than 5%) of the population and may not represent viral activity levels for the entire state or territory.

Data Limitations: Wastewater data cannot determine the source of influenza A viruses. Detections could come from a human or from an animal (like a bird) or an animal product (like milk from an infected cow).

Related Pages
​https://www.cdc.gov/nwss/rv/InfluenzaA-national-data.html
 
You must log in or register to reply here.
Back
Top